2. Experimentalsection
2.1.Materials
All chemicals were purchased from Merck and Sigma-Aldrich
and used without any further purification. Oligonucleotide
sequences used in this study are as follows: 5-carboxy fluorescein
fluorophore labeled at the 5′ terminal ssDNA (fDNA) sequence is
FAM―CCTGTTGCTTCTCTTAATTCC,the sequence of complementary
target (cDNA, part of EGFR gene without deletion mutation at
codons 746–752 in exon 19) is GGAATTAAGAGAAGCAACAGG, and
the sequence of mismatch DNA possessing 19 bases deletion
mutation at exon 19 of EGFR gene (mDNA) is CCATCA-
CCATCATAGTGTCCTCCTGAACC,which were purchased from BIONEER
( Takapouzist Co.Iran ).Fluorescence spectra were measured using
JASCO-FP-750, Rev.1.00 fluorometer.TEM images were recorded
using a Philips CM120 microscope. SEM images were recorded
using a MIRA3 TESCAN microscope.